/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 *modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 *EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 */
#ifndef __LWIP_TCP_IMPL_H__
#define __LWIP_TCP_IMPL_H__

#include "lwip/opt.h"

#if LWIP_TCP /* don't build if not configured for use in lwipopts.h */

#include "lwip/tcp.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/ip.h"
#include "lwip/icmp.h"
#include "lwip/err.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Functions for interfacing with TCP: */

/* Lower layer interface to TCP: */
void tcp_init(void); /* Initialize this module. */
void tcp_tmr(void);  /* Must be called every
                        TCP_TMR_INTERVAL
                        ms. (Typically 250 ms). */
/* It is also possible to call these two functions at the right
   intervals (instead of calling tcp_tmr()). */
void tcp_slowtmr(void);
void tcp_fasttmr(void);

/* Only used by IP to pass a TCP segment to TCP: */
void tcp_input(struct pbuf *p, struct netif *inp);
/* Used within the TCP code only: */
struct tcp_pcb *tcp_alloc(u8_t prio);
void tcp_abandon(struct tcp_pcb *pcb, int reset);
err_t tcp_send_empty_ack(struct tcp_pcb *pcb);
void tcp_rexmit(struct tcp_pcb *pcb);
void tcp_rexmit_rto(struct tcp_pcb *pcb);
void tcp_rexmit_fast(struct tcp_pcb *pcb);
u32_t tcp_update_rcv_ann_wnd(struct tcp_pcb *pcb);
err_t tcp_process_refused_data(struct tcp_pcb *pcb);

/**
 * This is the Nagle algorithm: try to combine user data to send as few TCP
 * segments as possible. Only send if
 * - no previously transmitted data on the connection remains unacknowledged or
 * - the TF_NODELAY flag is set (nagle algorithm turned off for this pcb) or
 * - the only unsent segment is at least pcb->mss bytes long (or there is more
 *   than one unsent segment - with lwIP, this can happen although unsent->len <
 * mss)
 * - or if we are in fast-retransmit (TF_INFR)
 */
#define tcp_do_output_nagle(tpcb)                                             \
  ((((tpcb)->unacked == NULL) || ((tpcb)->flags & (TF_NODELAY | TF_INFR)) ||  \
    (((tpcb)->unsent != NULL) && (((tpcb)->unsent->next != NULL) ||           \
                                  ((tpcb)->unsent->len >= (tpcb)->mss))) ||   \
    ((tcp_sndbuf(tpcb) == 0) || (tcp_sndqueuelen(tpcb) >= TCP_SND_QUEUELEN))) \
       ? 1                                                                    \
       : 0)
#define tcp_output_nagle(tpcb) \
  (tcp_do_output_nagle(tpcb) ? tcp_output(tpcb) : ERR_OK)

#define TCP_SEQ_LT(a, b) ((s32_t)((u32_t)(a) - (u32_t)(b)) < 0)
#define TCP_SEQ_LEQ(a, b) ((s32_t)((u32_t)(a) - (u32_t)(b)) <= 0)
#define TCP_SEQ_GT(a, b) ((s32_t)((u32_t)(a) - (u32_t)(b)) > 0)
#define TCP_SEQ_GEQ(a, b) ((s32_t)((u32_t)(a) - (u32_t)(b)) >= 0)
/* is b<=a<=c? */
#if 0 /* see bug #10548 */
#define TCP_SEQ_BETWEEN(a, b, c) ((c) - (b) >= (a) - (b))
#endif
#define TCP_SEQ_BETWEEN(a, b, c) (TCP_SEQ_GEQ(a, b) && TCP_SEQ_LEQ(a, c))
#define TCP_FIN 0x01U
#define TCP_SYN 0x02U
#define TCP_RST 0x04U
#define TCP_PSH 0x08U
#define TCP_ACK 0x10U
#define TCP_URG 0x20U
#define TCP_ECE 0x40U
#define TCP_CWR 0x80U

#define TCP_FLAGS 0x3fU

/* Length of the TCP header, excluding options. */
#define TCP_HLEN 20

#ifndef TCP_TMR_INTERVAL
/* Changed by Espressif */
#define TCP_TMR_INTERVAL 125 /* The TCP timer interval in milliseconds. */
#endif                       /* TCP_TMR_INTERVAL */

#ifndef TCP_FAST_INTERVAL
#define TCP_FAST_INTERVAL \
  TCP_TMR_INTERVAL /* the fine grained timeout in milliseconds */
#endif             /* TCP_FAST_INTERVAL */

#ifndef TCP_SLOW_INTERVAL
#define TCP_SLOW_INTERVAL \
  (2 * TCP_TMR_INTERVAL) /* the coarse grained timeout in milliseconds */
#endif                   /* TCP_SLOW_INTERVAL */

#define TCP_FIN_WAIT_TIMEOUT 20000 /* milliseconds */
#define TCP_SYN_RCVD_TIMEOUT 20000 /* milliseconds */

#define TCP_OOSEQ_TIMEOUT 6U /* x RTO */

#ifndef TCP_MSL
#define TCP_MSL 60000UL /* The maximum segment lifetime in milliseconds */
#endif

/* Keepalive values, compliant with RFC 1122. Don't change this unless you know
 * what you're doing */
#ifndef TCP_KEEPIDLE_DEFAULT
/* Changed by Espressif */
#define TCP_KEEPIDLE_DEFAULT \
  120000UL /* Default KEEPALIVE timer in milliseconds */
#endif

#ifndef TCP_KEEPINTVL_DEFAULT
/* Changed by Espressif */
#define TCP_KEEPINTVL_DEFAULT \
  10000UL /* Default Time between KEEPALIVE probes in milliseconds */
#endif

#ifndef TCP_KEEPCNT_DEFAULT
#define TCP_KEEPCNT_DEFAULT 9U /* Default Counter for KEEPALIVE probes */
#endif

#define TCP_MAXIDLE                                                          \
  TCP_KEEPCNT_DEFAULT *TCP_KEEPINTVL_DEFAULT /* Maximum KEEPALIVE probe time \
                                                */

/* Fields are (of course) in network byte order.
 * Some fields are converted to host byte order in tcp_input().
 */
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/bpstruct.h"
#endif
PACK_STRUCT_BEGIN
struct tcp_hdr {
  PACK_STRUCT_FIELD(u16_t src);
  PACK_STRUCT_FIELD(u16_t dest);
  PACK_STRUCT_FIELD(u32_t seqno);
  PACK_STRUCT_FIELD(u32_t ackno);
  PACK_STRUCT_FIELD(u16_t _hdrlen_rsvd_flags);
  PACK_STRUCT_FIELD(u16_t wnd);
  PACK_STRUCT_FIELD(u16_t chksum);
  PACK_STRUCT_FIELD(u16_t urgp);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/epstruct.h"
#endif

#define TCPH_HDRLEN(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) >> 12)
#define TCPH_FLAGS(phdr) (ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS)

#define TCPH_HDRLEN_SET(phdr, len) \
  (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | TCPH_FLAGS(phdr))
#define TCPH_FLAGS_SET(phdr, flags)                                            \
  (phdr)->_hdrlen_rsvd_flags =                                                 \
      (((phdr)->_hdrlen_rsvd_flags & PP_HTONS((u16_t)(~(u16_t)(TCP_FLAGS)))) | \
       htons(flags))
#define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags) \
  (phdr)->_hdrlen_rsvd_flags = htons(((len) << 12) | (flags))

#define TCPH_SET_FLAG(phdr, flags) \
  (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | htons(flags))
#define TCPH_UNSET_FLAG(phdr, flags) \
  (phdr)->_hdrlen_rsvd_flags =       \
      htons(ntohs((phdr)->_hdrlen_rsvd_flags) | (TCPH_FLAGS(phdr) & ~(flags)))

#define TCP_TCPLEN(seg) \
  ((seg)->len + ((TCPH_FLAGS((seg)->tcphdr) & (TCP_FIN | TCP_SYN)) != 0))

/** Flags used on input processing, not on pcb->flags
*/
#define TF_RESET (u8_t) 0x08U   /* Connection was reset. */
#define TF_CLOSED (u8_t) 0x10U  /* Connection was sucessfully closed. */
#define TF_GOT_FIN (u8_t) 0x20U /* Connection was closed by the remote end. */

#if LWIP_EVENT_API

#define TCP_EVENT_ACCEPT(pcb, err, ret)                                        \
  ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_ACCEPT, NULL, 0, \
                       err)
#define TCP_EVENT_SENT(pcb, space, ret)                                   \
  ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_SENT, NULL, \
                       space, ERR_OK)
#define TCP_EVENT_RECV(pcb, p, err, ret)                                    \
  ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_RECV, (p), 0, \
                       (err))
#define TCP_EVENT_CLOSED(pcb, ret)                                           \
  ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_RECV, NULL, 0, \
                       ERR_OK)
#define TCP_EVENT_CONNECTED(pcb, err, ret)                                     \
  ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_CONNECTED, NULL, \
                       0, (err))
#define TCP_EVENT_POLL(pcb, ret)                                             \
  ret = lwip_tcp_event((pcb)->callback_arg, (pcb), LWIP_EVENT_POLL, NULL, 0, \
                       ERR_OK)
#define TCP_EVENT_ERR(errf, arg, err) \
  lwip_tcp_event((arg), NULL, LWIP_EVENT_ERR, NULL, 0, (err))

#else /* LWIP_EVENT_API */

#define TCP_EVENT_ACCEPT(pcb, err, ret)                         \
  do {                                                          \
    if ((pcb)->accept != NULL)                                  \
      (ret) = (pcb)->accept((pcb)->callback_arg, (pcb), (err)); \
    else                                                        \
      (ret) = ERR_ARG;                                          \
  } while (0)

#define TCP_EVENT_SENT(pcb, space, ret)                         \
  do {                                                          \
    if ((pcb)->sent != NULL)                                    \
      (ret) = (pcb)->sent((pcb)->callback_arg, (pcb), (space)); \
    else                                                        \
      (ret) = ERR_OK;                                           \
  } while (0)

#define TCP_EVENT_RECV(pcb, p, err, ret)                           \
  do {                                                             \
    if ((pcb)->recv != NULL) {                                     \
      (ret) = (pcb)->recv((pcb)->callback_arg, (pcb), (p), (err)); \
    } else {                                                       \
      (ret) = tcp_recv_null(NULL, (pcb), (p), (err));              \
    }                                                              \
  } while (0)

#define TCP_EVENT_CLOSED(pcb, ret)                                   \
  do {                                                               \
    if (((pcb)->recv != NULL)) {                                     \
      (ret) = (pcb)->recv((pcb)->callback_arg, (pcb), NULL, ERR_OK); \
    } else {                                                         \
      (ret) = ERR_OK;                                                \
    }                                                                \
  } while (0)

#define TCP_EVENT_CONNECTED(pcb, err, ret)                         \
  do {                                                             \
    if ((pcb)->connected != NULL)                                  \
      (ret) = (pcb)->connected((pcb)->callback_arg, (pcb), (err)); \
    else                                                           \
      (ret) = ERR_OK;                                              \
  } while (0)

#define TCP_EVENT_POLL(pcb, ret)                       \
  do {                                                 \
    if ((pcb)->poll != NULL)                           \
      (ret) = (pcb)->poll((pcb)->callback_arg, (pcb)); \
    else                                               \
      (ret) = ERR_OK;                                  \
  } while (0)

#define TCP_EVENT_ERR(errf, arg, err)         \
  do {                                        \
    if ((errf) != NULL) (errf)((arg), (err)); \
  } while (0)

#endif /* LWIP_EVENT_API */

/** Enabled extra-check for TCP_OVERSIZE if LWIP_DEBUG is enabled */
#if TCP_OVERSIZE && defined(LWIP_DEBUG)
#define TCP_OVERSIZE_DBGCHECK 1
#else
#define TCP_OVERSIZE_DBGCHECK 0
#endif

/** Don't generate checksum on copy if CHECKSUM_GEN_TCP is disabled */
#define TCP_CHECKSUM_ON_COPY (LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_TCP)

/* This structure represents a TCP segment on the unsent, unacked and ooseq
 * queues */
struct tcp_seg {
  struct tcp_seg *next; /* used when putting segements on a queue */
  struct pbuf *p;       /* buffer containing data + TCP header */
  /* Changed by Espressif */
  void *dataptr; /* pointer to the TCP data in the pbuf */
  u16_t len;     /* the TCP length of this segment */
#if TCP_OVERSIZE_DBGCHECK
  u16_t oversize_left; /* Extra bytes available at the end of the last
                          pbuf in unsent (used for asserting vs.
                          tcp_pcb.unsent_oversized only) */
#endif                 /* TCP_OVERSIZE_DBGCHECK */
#if TCP_CHECKSUM_ON_COPY
  u16_t chksum;
  u8_t chksum_swapped;
#endif /* TCP_CHECKSUM_ON_COPY */
  u8_t flags;
#define TF_SEG_OPTS_MSS (u8_t) 0x01U /* Include MSS option. */
#define TF_SEG_OPTS_TS (u8_t) 0x02U  /* Include timestamp option. */
#define TF_SEG_DATA_CHECKSUMMED                           \
  (u8_t) 0x04U            /* ALL data (not the header) is \
                             checksummed into 'chksum' */
  struct tcp_hdr *tcphdr; /* the TCP header */
};

#define LWIP_TCP_OPT_LENGTH(flags) \
  (flags & TF_SEG_OPTS_MSS ? 4 : 0) + (flags & TF_SEG_OPTS_TS ? 12 : 0)

/** This returns a TCP header option for MSS in an u32_t */
#define TCP_BUILD_MSS_OPTION(mss) htonl(0x02040000 | ((mss) &0xFFFF))

/* Global variables: */
extern struct tcp_pcb *tcp_input_pcb;
extern u32_t tcp_ticks;
extern u8_t tcp_active_pcbs_changed;

/* The TCP PCB lists. */
union tcp_listen_pcbs_t {/* List of all TCP PCBs in LISTEN state. */
  struct tcp_pcb_listen *listen_pcbs;
  struct tcp_pcb *pcbs;
};
extern struct tcp_pcb *tcp_bound_pcbs;
extern union tcp_listen_pcbs_t tcp_listen_pcbs;
extern struct tcp_pcb *tcp_active_pcbs; /* List of all TCP PCBs that are in a
             state in which they accept or send
             data. */
extern struct tcp_pcb *tcp_tw_pcbs;     /* List of all TCP PCBs in TIME-WAIT. */

extern struct tcp_pcb *tcp_tmp_pcb; /* Only used for temporary storage. */

/* Axioms about the above lists:
   1) Every TCP PCB that is not CLOSED is in one of the lists.
   2) A PCB is only in one of the lists.
   3) All PCBs in the tcp_listen_pcbs list is in LISTEN state.
   4) All PCBs in the tcp_tw_pcbs list is in TIME-WAIT state.
*/
/* Define two macros, TCP_REG and TCP_RMV that registers a TCP PCB
   with a PCB list or removes a PCB from a list, respectively. */
#ifndef TCP_DEBUG_PCB_LISTS
#define TCP_DEBUG_PCB_LISTS 0
#endif
#if TCP_DEBUG_PCB_LISTS
#define TCP_REG(pcbs, npcb)                                                  \
  do {                                                                       \
    LWIP_DEBUGF(TCP_DEBUG,                                                   \
                ("TCP_REG %p local port %d\n", (npcb), (npcb)->local_port)); \
    for (tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL;                         \
         tcp_tmp_pcb = tcp_tmp_pcb->next) {                                  \
      LWIP_ASSERT("TCP_REG: already registered\n", tcp_tmp_pcb != (npcb));   \
    }                                                                        \
    LWIP_ASSERT("TCP_REG: pcb->state != CLOSED",                             \
                ((pcbs) == &tcp_bound_pcbs) || ((npcb)->state != CLOSED));   \
    (npcb)->next = *(pcbs);                                                  \
    LWIP_ASSERT("TCP_REG: npcb->next != npcb", (npcb)->next != (npcb));      \
    *(pcbs) = (npcb);                                                        \
    LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane());                  \
    tcp_timer_needed();                                                      \
  } while (0)
#define TCP_RMV(pcbs, npcb)                                           \
  do {                                                                \
    LWIP_ASSERT("TCP_RMV: pcbs != NULL", *(pcbs) != NULL);            \
    LWIP_DEBUGF(TCP_DEBUG,                                            \
                ("TCP_RMV: removing %p from %p\n", (npcb), *(pcbs))); \
    if (*(pcbs) == (npcb)) {                                          \
      *(pcbs) = (*pcbs)->next;                                        \
    } else                                                            \
      for (tcp_tmp_pcb = *(pcbs); tcp_tmp_pcb != NULL;                \
           tcp_tmp_pcb = tcp_tmp_pcb->next) {                         \
        if (tcp_tmp_pcb->next == (npcb)) {                            \
          tcp_tmp_pcb->next = (npcb)->next;                           \
          break;                                                      \
        }                                                             \
      }                                                               \
    (npcb)->next = NULL;                                              \
    LWIP_ASSERT("TCP_RMV: tcp_pcbs sane", tcp_pcbs_sane());           \
    LWIP_DEBUGF(TCP_DEBUG,                                            \
                ("TCP_RMV: removed %p from %p\n", (npcb), *(pcbs)));  \
  } while (0)

#else /* LWIP_DEBUG */

#define TCP_REG(pcbs, npcb) \
  do {                      \
    (npcb)->next = *pcbs;   \
    *(pcbs) = (npcb);       \
    tcp_timer_needed();     \
  } while (0)

#define TCP_RMV(pcbs, npcb)                          \
  do {                                               \
    if (*(pcbs) == (npcb)) {                         \
      (*(pcbs)) = (*pcbs)->next;                     \
    } else {                                         \
      for (tcp_tmp_pcb = *pcbs; tcp_tmp_pcb != NULL; \
           tcp_tmp_pcb = tcp_tmp_pcb->next) {        \
        if (tcp_tmp_pcb->next == (npcb)) {           \
          tcp_tmp_pcb->next = (npcb)->next;          \
          break;                                     \
        }                                            \
      }                                              \
    }                                                \
    (npcb)->next = NULL;                             \
  } while (0)

#endif /* LWIP_DEBUG */

#define TCP_REG_ACTIVE(npcb)         \
  do {                               \
    TCP_REG(&tcp_active_pcbs, npcb); \
    tcp_active_pcbs_changed = 1;     \
  } while (0)

#define TCP_RMV_ACTIVE(npcb)         \
  do {                               \
    TCP_RMV(&tcp_active_pcbs, npcb); \
    tcp_active_pcbs_changed = 1;     \
  } while (0)

#define TCP_PCB_REMOVE_ACTIVE(pcb)         \
  do {                                     \
    tcp_pcb_remove(&tcp_active_pcbs, pcb); \
    tcp_active_pcbs_changed = 1;           \
  } while (0)

/* Internal functions: */
struct tcp_pcb *tcp_pcb_copy(struct tcp_pcb *pcb);
void tcp_pcb_purge(struct tcp_pcb *pcb);
void tcp_pcb_remove(struct tcp_pcb **pcblist, struct tcp_pcb *pcb);

void tcp_segs_free(struct tcp_seg *seg);
void tcp_seg_free(struct tcp_seg *seg);
struct tcp_seg *tcp_seg_copy(struct tcp_seg *seg);

#define tcp_ack(pcb)                   \
  do {                                 \
    if ((pcb)->flags & TF_ACK_DELAY) { \
      (pcb)->flags &= ~TF_ACK_DELAY;   \
      (pcb)->flags |= TF_ACK_NOW;      \
    } else {                           \
      (pcb)->flags |= TF_ACK_DELAY;    \
    }                                  \
  } while (0)

#define tcp_ack_now(pcb)        \
  do {                          \
    (pcb)->flags |= TF_ACK_NOW; \
  } while (0)

err_t tcp_send_fin(struct tcp_pcb *pcb);
err_t tcp_enqueue_flags(struct tcp_pcb *pcb, u8_t flags);

void tcp_rexmit_seg(struct tcp_pcb *pcb, struct tcp_seg *seg);

void tcp_rst(u32_t seqno, u32_t ackno, ip_addr_t *local_ip,
             ip_addr_t *remote_ip, u16_t local_port, u16_t remote_port);

u32_t tcp_next_iss(void);

void tcp_keepalive(struct tcp_pcb *pcb);
void tcp_zero_window_probe(struct tcp_pcb *pcb);

#if TCP_CALCULATE_EFF_SEND_MSS
u16_t tcp_eff_send_mss(u16_t sendmss, ip_addr_t *addr);
#endif /* TCP_CALCULATE_EFF_SEND_MSS */

#if LWIP_CALLBACK_API
err_t tcp_recv_null(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err);
#endif /* LWIP_CALLBACK_API */

#if TCP_DEBUG || TCP_INPUT_DEBUG || TCP_OUTPUT_DEBUG
void tcp_debug_print(struct tcp_hdr *tcphdr);
void tcp_debug_print_flags(u8_t flags);
void tcp_debug_print_state(enum tcp_state s);
void tcp_debug_print_pcbs(void);
s16_t tcp_pcbs_sane(void);
#else
#define tcp_debug_print(tcphdr)
#define tcp_debug_print_flags(flags)
#define tcp_debug_print_state(s)
#define tcp_debug_print_pcbs()
#define tcp_pcbs_sane() 1
#endif /* TCP_DEBUG */

/** External function (implemented in timers.c), called when TCP detects
 * that a timer is needed (i.e. active- or time-wait-pcb found). */
void tcp_timer_needed(void);

#ifdef __cplusplus
}
#endif

#endif /* LWIP_TCP */

#endif /* __LWIP_TCP_H__ */
